Answer: Myocarditis (inflammation of the heart muscle) and Pericarditis (inflammation of the outer lining of the heart) result from the body immune system's response to an infection or a trigger (including the COVID-19 imitating or inactive virus). Source (CDC) Australia Department of Health explains (in the section How Do COVID-19 Vaccines Work ) that COVID-19 vaccines like BioNTech, Pfizer Comirnaty , Moderna mRNA-1273 Spikevax , and Oxford/AstraZeneca COVID-19 vaccine (AZD1222) Vaxzevria or Covishield trains our body's immune system to recognise and cleanse our bodies from viruses or bacteria that could cause COVID-19. As the COVID-19 imitating (or inactive) vaccine enters the human body, our immune system learns to spot and deal with the more serious and actual COVID-19 virus. It is interesting to know that old-school vaccines like Synovac contain the real inactive COVID-19 virus. (A bit scary though, since you can develop a full-on COVID-19 sickness)....
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